Drug Delivery Device with Means for Disabling Activation of Expelling Mechanism
First Claim
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1. A drug delivery device adapted to receive a cartridge comprising a cylindrical body portion, a distal outlet portion and an axially displaceable piston, the drug delivery device comprising:
- a housing,a cartridge holder adapted to receive and hold a cartridge, having;
a receiving state in which a cartridge can be inserted and received, anda holding state in which an inserted cartridge is held in an operational position,an expelling assembly comprising;
a piston rod adapted to engage and axially displace a piston in a loaded cartridge in a distal direction to thereby expel a dose of drug from the cartridge, anda drive assembly comprising;
drive structure adapted to move the piston rod in the distal direction and comprising a drive spring,setting structure means allowing a user to simultaneously set a dose amount to be expelled and strain the drive spring correspondingly, anduser actuated release structure means for releasing the drive spring to thereby move the piston rod in the distal direction corresponding to the set dose,wherein the drive assembly cannot be released to move the piston rod unless the cartridge holder is in the holding state.
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Abstract
A drug delivery device has a cartridge holder adapted to receive and hold a cartridge, the cartridge holder having a receiving and a holding state. The device further comprises a drive assembly with a piston rod and a drive spring, setting means allowing a user to set a dose amount to be expelled and strain the drive spring correspondingly, and user actuated release means for releasing the drive spring, wherein the drive assembly spring cannot be released to move the piston rod unless the cartridge holder is in the holding state.
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Citations
15 Claims
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1. A drug delivery device adapted to receive a cartridge comprising a cylindrical body portion, a distal outlet portion and an axially displaceable piston, the drug delivery device comprising:
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a housing, a cartridge holder adapted to receive and hold a cartridge, having; a receiving state in which a cartridge can be inserted and received, and a holding state in which an inserted cartridge is held in an operational position, an expelling assembly comprising; a piston rod adapted to engage and axially displace a piston in a loaded cartridge in a distal direction to thereby expel a dose of drug from the cartridge, and a drive assembly comprising; drive structure adapted to move the piston rod in the distal direction and comprising a drive spring, setting structure means allowing a user to simultaneously set a dose amount to be expelled and strain the drive spring correspondingly, and user actuated release structure means for releasing the drive spring to thereby move the piston rod in the distal direction corresponding to the set dose, wherein the drive assembly cannot be released to move the piston rod unless the cartridge holder is in the holding state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a drug delivery device adapted to receive a cartridge comprising a cylindrical body portion, a distal outlet portion and an axially displaceable piston, comprising:
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providing a drug delivery device comprising; a cartridge holder adapted to receive and hold a cartridge, a drive assembly comprising a piston rod, a drive spring for driving the piston rod in a distal direction, setting structure allowing a user to simultaneously set a dose amount to be expelled and strain the drive spring correspondingly, and user actuated release structure for releasing the drive spring to thereby move the piston rod in the distal direction corresponding to the set dose, and blocking structure preventing, in a blocking state, the release structure means from being released and/or preventing the drive structure from moving the piston rod, operating the cartridge holder from; a receiving state in which a cartridge can be inserted and received and the blocking structure is in a blocking state, to an operational state in which an inserted cartridge is held in an operational position and the blocking structure is released from the blocking state.
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Specification